Orioles closer Zach Britton said on Twitter that Thursday’s surgery to repair a ruptured right Achilles tendon was a success.

Britton’s injury, suffered Tuesday night while training in California, will keep him out for six months, with the surgery interrupting what Britton described on Wednesday as a comeback that was taking shape nicely.

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After putting together one of the best seasons any relief pitcher in baseball history in 2016, Britton had a frustrating 2017. He spent two stints on the disabled list totaling over 10 weeks because of a forearm strain, and a knee problem ended his season early.

The All-Star closer, who is entering his final season of club control with the Orioles, was hoping for a healthy 2018 to enter free agency. Instead, the best-case scenario has him returning to the active roster around mid-June.

In his stead, the Orioles will have to rely on a trio of back-end relievers — Brad Brach, Mychal Givens and Darren O’Day — who filled in for Britton in 2017.